Portable electronic device and antenna thereof

Abstract

An antenna is provided. The antenna includes a radiator, a feed conductor and a ground conductor. The radiator includes a body and a parasitic element. An aperture is formed on the body, and the body encloses the aperture. The parasitic element is connected to the body and extended into the aperture, wherein the parasitic element is connected to the body at a parasitic location. The feed conductor is connected to the body, wherein a signal, fed to the body by the feed conductor, travels on the body, and passes the parasitic location to the parasitic element. The ground conductor is connected to the body.

What is claimed is: 
     
       1. An antenna, comprising:
 a radiator, comprising: 
 a body, wherein an aperture is formed on the body, and the body encloses the aperture; and 
 an element, connected to the body and extended into the aperture, wherein the element is connected to the body at a location; 
 a feed conductor, connected to the body, wherein a signal, fed to the body by the feed conductor, travels on the body, and passes the location to the element, wherein a path length from the feed conductor to the location is within a range from 1/2λ to 1/4λ, wherein λ is a wavelength of the signal; and 
 a ground conductor, connected to the body. 
 
     
     
       2. The antenna as claimed in  claim 1 , wherein a slot is formed between the element and the body. 
     
     
       3. The antenna as claimed in  claim 1 , wherein a path length from the feed conductor to the location is 1/4λ. 
     
     
       4. The antenna as claimed in  claim 3 , wherein the element is substantially L-shaped. 
     
     
       5. The antenna as claimed in  claim 3 , wherein the element comprises a first section and a second section, the first section is connected to the second section, the first section extends in a first direction, the second section extends in a second direction, the first direction is perpendicular to the second direction, and an end of the first section is connected to the location. 
     
     
       6. The antenna as claimed in  claim 5 , wherein a line width of the first section is greater than a line width of the second section. 
     
     
       7. The antenna as claimed in  claim 5 , wherein the element further comprises a bent portion, and the bent portion is formed on a free end of the second section. 
     
     
       8. The antenna as claimed in  claim 3 , wherein a notch is formed on a side of the element. 
     
     
       9. The antenna as claimed in  claim 1 , wherein a path length from the feed conductor to the location is 1/2λ. 
     
     
       10. The antenna as claimed in  claim 9 , wherein the element is substantially L-shaped. 
     
     
       11. The antenna as claimed in  claim 9 , wherein the element comprises a first section and a second section, the first section is connected to the second section, the first section extends in a first direction, the second section extends in a second direction, the first direction is perpendicular to the second direction, and an end of the first section is connected to the location. 
     
     
       12. A portable electronic device, comprising:
 an antenna, comprising: 
 a radiator, comprising: 
 a body, wherein an aperture is formed on the body, and the body encloses the aperture; and 
 an element, connected to the body and extended into the aperture, wherein the element is connected to the body at a location; 
 a feed conductor, connected to the body, wherein a signal, fed to the body by the feed conductor, travels on the body, and passes the location to the element, wherein a path length from the feed conductor to the location is within a range from 1/2λ to 1/4λ, wherein λ is a wavelength of the signal; and 
 a ground conductor, connected to the body; and 
 a circuit board; wherein the feed conductor and the ground conductor electrically connect the body to the circuit board, and the antenna modifies an electric field distribution of the circuit board. 
 
     
     
       13. The portable electronic device as claimed in  claim 12 , wherein a slot is formed between the element and the body. 
     
     
       14. The portable electronic device as claimed in  claim 12 , wherein the element is substantially L-shaped. 
     
     
       15. The portable electronic device as claimed in  claim 12 , wherein the element comprises a first section and a second section, the first section is connected to the second section, the first section extends in a first direction, the second section extends in a second direction, the first direction is perpendicular to the second direction, and an end of the first section is connected to the location. 
     
     
       16. The portable electronic device as claimed in  claim 15 , wherein a line width of the first section is greater than a line width of the second section. 
     
     
       17. The portable electronic device as claimed in  claim 15 , wherein the element further comprises a bent portion, and the bent portion is formed on a free end of the second section. 
     
     
       18. The portable electronic device as claimed in  claim 17 , wherein a notch is formed on a side of the element. 
     
     
       19. The portable electronic device as claimed in  claim 12 , wherein the element is substantially L-shaped. 
     
     
       20. The portable electronic device as claimed in  claim 12 , wherein the element comprises a first section and a second section, the first section is connected to the second section, the first section extends in a first direction, the second section extends in a second direction, the first direction is perpendicular to the second direction, and an end of the first section is connected to the location.